Cylinder-honing device



Sept. 27, 1927. 1 3,459 W. JOHNSON CYLINDER HONING DEVICE Filed Dec. 26.1924 3 Sheets-Sheet l Inu Qnfov B LQl\\\am Johnson 1,643,459 Sept. 27,1927- JQHNSON CYLINDER HONING DEVICE Filed D60. 26 1924 I 3 Sheets-Sheet 2 1 I0 z a Lgi.

l2. l5 In a Mov minim Johnson Sept. 27, 1927.

. 1,643,459 W. JOHNSON CYLINDER HONING DEVICE Filed Dec. 26. 1924 6Sheets-Sheet 3 UJHham Johnson Patented Sept. 27, 1927.

PATENT OFFICE.

wILLIm common, or nusxnoon acron ms, mrcn'rean.

, CYLINDER-BORING. DEVICE.

' Application and December 20, 1924. Serial No. m;

'This 'iinvention relates to cylinder honing devices and particularlyto'those of. the type adaptedto perform the finishing or polish ingoperation upon the interior of engine cylinders and the like.

It is customary, in the manufacture of en gmes and other devices havingcylinders with pistons to reci rocate therein, to produce a smooth polised interior surface on the cylinder after it has been bored and reamed.This final operation is commonly known as lapping or honing and is erformed bythe use of afine abrasive. any

methods of honing have been used and tools for the purpose have beencontrived. but owing to the fact that the'abras'i-vestones commonly usedwith honing devices wear away rapidly in use, it has been founddifiicult to provide an easy means of adjustment to compensate for thewearing away of the stones, bothto maintain a constant contact with thecylinder walls as the device is used and also tomaintain a perfectalignment so that the interior of the cylinder will be true and accuratewhen the operation is finished. Other disadvantages of honing devicesthat have been used are that no simple and con- Venient means hasbeenprovided to retract the abradi-ng stones to enter them into thecylinder at the beginning of the operation and it has alsobeen foundthat the stones are apt to bind and catch as they are rotated in thecylinder causing them to chatter and resulting in an uneven surface onthe cylinder.

It is the object of this invention to overcome the above describeddifficulties and disadvantages and also to provide various other novelfeatures of construction and arrangement in the honing devicehereinafter more fully described and particularly pointed out in theclaims, reference being had to the accompanying drawings in which,

Fig. 1 is a vertical elevation of a honing device embodying thisinvention.

Fig. 2 is a vertical axial section of the same.

Fig. 3 is a transverse section onthe line 3-3 of Fig. 2 showing theabrading stones locked in retracted position. i

Fig. 4 is a transverse section on the'line 4-4 of Fig. 2 illustratingthe position of the driving elements when the stones are in retractedposition.

5 is a section similar to Fig. 3 showmg t e stones extended to bearagainst the inner surface of a cylinder. Q *FIg. 6 is a section similarto Fig. 4 showing the position of the driving elements when'the stonesare extended and the device is bem rotated, and

.F 1g. is a perspective view showing some of the essentlal parts of theapparatus in partially disassembled position, some of the parts beingshown in section and others with parts broken away.

4 Like numbers refer to like parts in all of the figures of thedrawings. I Themain body member of the device comprises a hub 1substantially triangular in cross sectlon and being provided at itsrespectlve upper and lower ends with integrally formed flanges 2 and 3.A central hole 4 extends completely through. the hub and is axiallylocated. The abrading stones 5, three of which are provided in thestructure disclosed, are each mounted upon a swinging arm 6 and the armsare located between the flanges. 2 and 3 and pivoted upon bolts 7 whichextend through the flanges. In order that the stones may be readilyremoved and replaced when they are worn out they are detachablyconnected to their respective arms by providing a dovetail tongue 8 uponeach stone. and as a matter of expediency in manufacture, it has beenfound desirable to cover the face of the stone with a coating of lead 9which may be more accurately formed into dove-tail shape than the stoneitself and which also provides a stronger construction. tail member ofthe stone fits within a dove tail groove upon the arm 6 and a clampingbar 10 provided with screws 11 is used to hold the stone in place uponthe arm.

- Each of the arms 6 of the stone at its swinging end is normally thrustoutward by a spring 12 which surrounds the bolt 7 and bears at one endagainst the hub and at the other end against the inner surface of thearm 6. i a

In order to cause all of the arms 6 to move outward or inward from thehub uniformly and in synchronism and also as a means of retaining thestones in retracted position, each arm is provided with a connecting rod13 which extends from the inner surface of each arm near itsverticalcenter and passes The dovethrough one of the three slots 14provided in the hub 1. lVithin the central opening 4 in the hub 1 thecrank shaft 15 is located and it is provided with three slots 16 oneabove the other, each of which receive the inner end of one of theconnecting rods 13.- T he inner ends of the connecting rods arepivotally attached by. pins 17 to the said crank shaft 15, said pointsof attachment being eccentrically located. In. the present structurewhere three arms and connecting rods are used the inner ends ofconnecting rods are spaced one hundred and twenty degrees apart aboutthe center of the shaft.

The slots 16 are cut deep enough into the shaft so that the connectingrods therein may swing to a position to 1ock the stones in retractedposition as illustrated in Fig. 3. This locking action is caused by thepins 17 swinging past the center of the shaft before the connecting rodsstrike the bottoms of the slots.

It will be seen that by the above described construction all of the arms6 are connected to the common crank shaft 15 and must move inward oroutward simultaneous as the shaft rotates within the huh I and also thatwhen the arms are fully retracted they are locked in that position by.reason of the inner ends of the connecting rods 13 swing ing slightlypast the center of the crank shaft. The retracting of the. arms may bedone either by rotating the crank shaft 15 or by compressing one or moreof the arms which will cause the crank shaft to rotate.

This device is adapted to be mounted for operation in a machine having arotating spindle with a chuck thereon to receive the driving shank 18whereby the whole structure will be rotated. The shank 18 extends intothe cap 19 at the upper end of the structure and is provided with theflange 20 which has the transverse groove 21 in its lower face. A boss22 extends upward from the surface of the flange 2 over which the cap 19fits and two diametrically opposite lugs 23 project upward within thecap from the boss 22. A disk 24 is interposed between the lugs 23 andthe flange 20 and the disk is provided with the tongues 25 and 26 on itsrespective upper and lower surfaces, said tongues being disposed atright angles to each other. The tongue 25 extends into the groove 21 andthe tongue 26 projects downward into the'plane of the lugs 23 and isadapted to engage the lugs to rotate the I body of the structure whenthe disk is rotated by the shank 18. The lugs 23 are made relativelysmall so that considerable slack motion is provided for the tongue 26,whereby it may rotate approximately ninety degrees from its engagementwith the lugs in one position before it engages the lugs in anotherposition. The interposing of the di k 24 With its right angularlydisposed rotated backward to retract and lock the arms carrying thestones and also to release the stones from retracted position when the"device is rotated-in the direction for operatmg as hereafter described.

The operating rotation of the device isthat indicated by the arrows inFigs. 4 and 6, being such as to pull the arms upon the pivot bolts 7 sothat they will trail and draw smoothly against the surface upon whichthey operate. In using the device the arms carrying the stones areretracted to the position shown in Fig. 3 whereat the device may readilybe inserted into the cylinder 28 to be operated upon. In this positionthe driving shank 18 is rotated backward, as shown in Fig. 4, until thetongue 26 engages the lugs 23 in the reverse position and the pins 27 onthe crank shaft 15 straddle the tongue and extend in front of thedriving surfaces of the lugs 23. hen the device has been inserted into acylinder 28 and the shank 18 started to rotate in its driving directionthe tongue 26 is caused to first engage the pins 27 and rotate the shaft15 sufiiciently to unlock the connecting rods 13 by swinging the crankpins beyond the center of the shaft, whereat the springs '12 act toswing the arms 6 outwardly and engage the stones 5 with the surface ofthe cylinder 28. As the shank 18 continues to rotate the tongue 26 willengage the driving surface of the lugs 23 and rotate the wholestructure.

It will be seen that the arms 6 being mounted to trail behind the pivotpins 7 during operation, the stones 5 will be drawn smoothly over thesurface of the cylinder completely obviating any tendency of the stonesto chatter. The arms carrying the stones are caused to move outwardly inunison therefore causing the stones to wear evenly and as they wear theyare retained constantly in contact with the surface operated upon by theoutward thrust of the springs 12 and no manual adjustment to compensatefor wear is required. Should the cylinder to be operated upon not beexactly aligned with the driving spindle in a which the shank 18 ismounted, the sliding coupling between the shank and the body member willcompensate for the'misalignment and allow the device to rotate evenly inthe center of the cylinder. By providing means for locking the stones inretracted position and also means for automatically unlocking the stonesto allow them to be extended and engage the cylinder wall, the

mounted upon the body member and adapted to swing outwardly therefrom,springs to swing the abrasive members outwardly, a connecting rodextending from the mner side of each abrasive member and each -attachedat its inner end to said crank shaft, whereby the abrasive members arecaused to spring in unison, the inner portions of said connecting rodsadapted to swing across the center of the crank shaft when the abrasivemembers are fully retracted whereby the abrasive members are locked inretracted 'position, and common means for rotating the body member andthe crank shaft, said r0- tating means being adapted to rotate the crankshaft a portion of a revolution before the body member is rotated.

2. A honing device comprising, a rotatable body member having an axialopening, a

plurality of abrasive members pivotally mounted thereon adapted to swingoutwardly, springs to swing the abrasive members outwardly, a crankshaft located in the axial opening of the body member, a connecting rodattached to each abrasive member and extending into the body member, theinner end of each connecting rod being eccentrically connected to thecrank shaft and the inner portion of each connecting rod adapt ed toswing across the center of the crank shaft when the abrasive membersare. fully retracted whereby the abrasive members are locked inretracted position, two diametrically opposite driving lugs projectingupwardly from the body member, a driving member having a tongueextending between and adapted to engage the driving lugs, said tonguehaving slack motion between the lugs, and pins projecting upwardly fromthe crank shaft to straddle the said tongue whereby a partial rotationof the crank shaft is imparted by the tongue prior to the engagement ofthe tongue with the driving lugs.

3. A honing device comprising, a rotatable body member having an axialopening, a crank shaft located in said opening, two diametricallyopposite driving lugs extending upwardly from the body member, a diskhaving a tongue on each of its respective upper and lower sides, saidtongues being disposed at right angles to eachother and the lower tonguelying between the driving lugs and having slack motion therebetween, adriving shank having a slot in its lower end to receive the upper tongueon said disk, two pins extending upwardly from said crank shaft atopposite sides of said lower tongue to impart a partial rotation to thecrank shaft prior to engagement of the tongue with the driving lugs, aplurality of arms pivotally attached to said body member, an abrasivestone detachably contongue and adapted, by rotation of thenected to theswinging end of each arm,.

springs to swim the arms outwardly, and a connecting ro attached to eacharm and extending into the body member, the inner end of each connectingrod being eccentrically connected to said crank shaft and the innerportion of each connecting rod adapted to swing across the center of thecrank shaft when the arms are fully retracted.

4. A honing device comprising a rotatable body member having an axialopening, a crank shaft located within said opening, a plurality ofabrasive members mounted on said body member and adapted to moveoutwardly therefrom, yieldablemeans to thrust the abrasive membersoutwardly, a connecting rod connected to each abrasive member andextending through the body member, the inner end ofeach connecting rodbeing eccentrically attached to the said crank shaft and the innerportion of each connecting rod adapted to move across'the center of saidcrank shaft when the abrasive members are fully retracted.

5. A honing device comprising, a rotatable body member, a plurality'ofabrasive members pivotally attached to the body member and adapted toswing outwardly therefrom, a locking member rotatable relative to thebody member, and a connecting rod attached to each pivoted abrasivemember and eccentrically attached to the locking member whereby the endsof the connecting rods attached to the locking member may be swung, byrotation of the locking member relative to the body member, across thecommon axis of the device to retain the abrasive members against outwardmovement.

6. A honing device comprising, a rotatable body member, a plurality ofabrasive members pivotally attached to the body member and adapted toswing outwardly therefrom, springmeans to swing the abrasive membersoutwardly, means for locking the abrasive members in retracted positionagainst action of said spring means, driving means for rotating the bodymember and associated with said locking means, and means forautomatically unlocking the abrasive members from retracted posit1onupon rotation of the body member by said driving means.

7. A honing device comprising, a rotatable body member, a plurality ofabrasive members pivotally mounted upon the body memher and adapted toswing outwardly therefrom, springs to swing -the abrasive membersoutwardly, means for causing the abrasive members to swing in unison,means for 5 locking the abrasive members in retracted position againstaction of said springs, driving means for rotating the body member andassociated with said locking means, and means for unlocking the abrasivemembers from retractedpositlon upon rotation of the 10 body member bysaid driving means.

In testimony whereof I aflix my signature.

WILLIAM JOHNSON.

